As part of the firm’s plans to extend voice control to a wider number of appliances around the home, Amazon also unveiled its £25 Smart Plug, which once in place will allow users to control the socket using Alexa voice commands via an Echo smart speaker.

Amazon’s senior vice-president of devices and services Dave Limp said the momentum around the smart home had been “incredible”, with more than 20,000 devices now available in the category.

The new Echo Dot will cost £49.99 and has been given an improved speaker, resulting in audio playing up to 70 per cent louder, Amazon said.

The firm’s smart home hub Echo Plus includes a built-in system to automatically find and connect with other smart home devices it detects nearby.

Echo Show, the video-screen carrying version of the smart speaker, has been given a revamp too. It will feature an improved speaker system alongside its 10-inch HD screen, which can be used to stream videos and make video calls.

The Echo Show will cost £219.99.

A range of companion devices were also unveiled, including the Echo Sub subwoofer, which helps boost the sound produced by connected Echo smart speakers.

The Echo Input allows users to make their existing speakers smart, by allowing them to be controlled by Alexa voice commands once connected.

Jorrit Van der Meulen, vice-president of Amazon devices international, said: “We want you to have access to Alexa everywhere - in your kitchen, in your living room, in your office, and more.